Two problems

[Markd102]

FG is applying full damage after a successful saving throw.

Also GM rolls are hidden whether or not that function is on or off in options.

5E
Latest Update
Mac

[Zacchaeus]

I'm not seeing either of those issues. Make sure that you are testing in a new campaign without extensions to eliminate those from the equation.

EDIT: My bad. I hadn't updated when I tested this. I can see that in fact full damage is being applied on a successful save. I'm still not seeing DM rolls always being hidden. It seems that is working as intended.

[Trenloe]

FG is applying full damage after a successful saving throw.
Also being discussed here: https://www.fantasygrounds.com/forums/showthread.php?84281-5E-bug-FGU-applies-always-the-full-damage-of-a-spell-even-on-a-successful-save Please continue discussion for this specific issue in that thread.